Bubble eliminating device and electrophoresis tank for automobile front end drainage structure
By designing a specialized bubble elimination device, the air bubbles in the drainage structure between the windshield and the engine compartment of a car are eliminated using a nozzle and spray pipe structure. This solves the problem of bubbles that cannot be eliminated during the electrophoresis process, improving the integrity of the electrophoretic coating and the quality of the car.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FAW VOLKSWAGEN AUTOMOTIVE CO LTD
- Filing Date
- 2025-06-05
- Publication Date
- 2026-06-12
AI Technical Summary
In the automotive electrophoresis process, air bubbles in the drainage structure between the windshield and the engine compartment cannot be effectively eliminated, resulting in an incomplete electrophoretic coating and the formation of bubble shrinkage defects.
Design a bubble elimination device, including several first connecting pipes, a first spray pipe and a first nozzle, with the nozzle facing the opening of the drainage structure, and combined with a support rod and a connecting rod to ensure that the electrophoretic liquid is effectively injected into the drainage structure to eliminate bubbles.
It improves the elimination of air bubbles in the drainage structure, reduces defects, and enhances the quality of automobile production.
Smart Images
Figure CN224350794U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of automotive coating technology, specifically to a bubble elimination device and an electrophoresis tank for the front drainage structure of an automobile. Background Technology
[0002] In automobile manufacturing, painting is a crucial production process, directly impacting the car's appearance and corrosion resistance. Currently, domestic automakers use a 360-degree rotating electrophoresis process to ensure uniform coating coverage. This method offers significant advantages in energy conservation, emission reduction, and process quality. However, in actual production, the box-shaped drainage structure located between the windshield and engine compartment is affected during the rotating electrophoresis process. The car is immersed face-down in the electrophoresis tank, and the drainage structure is also rotated and immersed upside down. Because some air exists in the drainage structure before immersion, it cannot escape during the rotating process, resulting in air bubbles remaining in the drainage structure after immersion, forming air bubbles that adhere to the bottom of the drainage structure. These air bubbles will hinder the contact between the sheet metal and the electrophoretic liquid at the drainage structure during the electrophoresis process, making it impossible for sufficient electrophoretic paint to be absorbed at that location, ultimately leading to defects such as electrophoretic bubble shrinkage and incomplete electrophoretic coating.
[0003] In existing technologies, air bubbles on the car body are eliminated by either oscillating the vehicle during electrophoresis or by installing Venturi nozzles on the electrophoresis liquid delivery pipe located at the bottom of the electrophoresis tank. However, neither of these methods is effective at eliminating air bubbles at the bottom of the drainage structure between the windshield and the engine compartment. This is because the oscillation of the vehicle during electrophoresis is limited to a 15° angle due to the height of the electrophoresis liquid in the tank, which is insufficient to effectively expel air bubbles from the drainage structure. Furthermore, the narrow opening of this drainage structure prevents the Venturi nozzles from effectively sweeping away the air bubbles within it. Therefore, a specialized air bubble elimination device needs to be developed specifically for the drainage structure between the windshield and the engine compartment. Utility Model Content
[0004] To address at least one of the aforementioned problems, this invention provides a bubble elimination device and an electrophoresis tank for the front-end drainage structure of an automobile.
[0005] In a first aspect, this application provides a bubble elimination device for a front-end drainage structure of an automobile, comprising a plurality of first connecting pipes, a plurality of first spray pipes, a plurality of first nozzles, a connecting rod, and two support rods; the inlets of the plurality of first connecting pipes are respectively connected to a plurality of outlets on an electrophoresis liquid delivery pipe located at the front end of an electrophoresis tank; the plurality of first spray pipes are arranged parallel to each other and in the same plane, each first spray pipe is inclined upward, the top of each first spray pipe faces the opening direction of the drainage structure when the automobile is immersed in the electrophoresis liquid, and the bottom ends of the plurality of first spray pipes are respectively connected to the outlets of the plurality of first connecting pipes; A nozzle is adopted with a diameter that gradually decreases from its bottom to its top. The spray direction of the first nozzle is the same as the extension direction of the first nozzle tube. The number of first nozzles is equal to the number of first nozzle tubes. The bottom ends of several first nozzles are respectively connected to the top ends of several first nozzle tubes. A connecting rod extends along the arrangement direction of the first nozzles and is connected to each first nozzle tube. A support rod is inclined upward and the inclination direction of the support rod is opposite to the inclination direction of the first nozzle tube. Two support rods are located at both ends of the connecting rod. The top ends of the support rods are connected to the ends of the connecting rods, and the bottom ends of the support rods are used to connect to the fixing frame of the electrophoresis liquid delivery tube.
[0006] Preferably, the number of the first connecting tubes is equal to the number of outlets on the electrophoresis liquid delivery tube located at the front end of the electrophoresis tank.
[0007] Preferably, the first connecting tube includes a first tube and a second tube; the inlet of the first tube is connected to the outlet of the electrophoresis liquid delivery tube; the length direction of the second tube forms an acute angle, a right angle, or an obtuse angle with the length direction of the first tube, and the inlet of the second tube is fixedly connected to the outlet of the first tube; the number of first nozzles is equal to the number of first connecting tubes, the first nozzles correspond one-to-one with the first connecting tubes, and the bottom end of the first nozzle is connected to the outlet of the second tube.
[0008] Preferably, the first connecting tube includes a first tube and a second tube; the inlet of the first tube is connected to the outlet of the electrophoresis liquid delivery tube; the length direction of the second tube forms an acute angle, a right angle, or an obtuse angle with the length direction of the first tube, the length direction of the second tube is the same as the arrangement direction of the first nozzles, the second tube has an inlet and multiple outlets, the multiple outlets are distributed along the length direction of the second tube, the inlet of the second tube is connected to the outlet of the first tube; the number of first nozzles is equal to the total number of outlets of the second tubes on the several first connecting tubes, the first nozzles correspond one-to-one with the outlets on the second tubes, and the bottom end of the first nozzle is connected to the outlet on the second tube.
[0009] Preferably, the connecting rod is located in the middle of each first nozzle.
[0010] Preferably, both ends of the connecting rod are provided with a tee pipe, the main pipe of the tee pipe is fixedly sleeved on the end of the connecting rod, and the branch pipe of the tee pipe is fixedly sleeved on the top of the support rod.
[0011] Preferably, the first nozzle is a direct-fire nozzle.
[0012] Secondly, this application provides an electrophoresis tank, including a tank body, with a plurality of horizontally arranged and parallel electrophoretic liquid delivery pipes laid at the bottom end of the tank body. The electrophoretic liquid delivery pipes extend along the width direction of the tank body, and a plurality of liquid outlets are opened on the same side of each electrophoretic liquid delivery pipe along its extension direction. The two ends of each electrophoretic liquid delivery pipe are fixedly connected to the bottom surface of the tank body by a fixing bracket. It also includes a bubble elimination device for the front drainage structure of an automobile as described above. The liquid inlets of a plurality of first connecting pipes are respectively connected to a plurality of liquid outlets on an electrophoretic liquid delivery pipe located at the front end of the tank body, and the bottom ends of two support rods are respectively connected to the fixing brackets at both ends of the electrophoretic liquid delivery pipe.
[0013] Preferably, it further includes several second connecting pipes, several second spray pipes, and several second nozzles; the inlets of the several second connecting pipes are respectively connected to the outlets at both ends of other electrophoresis liquid delivery pipes; each second spray pipe is set vertically upward or inclined upward, and the bottom ends of the several second spray pipes are respectively connected to the outlets of the several second connecting pipes; the second nozzles are nozzles with a diameter that gradually decreases from their bottom end to their top end, and the spray direction of the second nozzles is the side of the car body when the car is immersed in the electrophoresis liquid; the number of second nozzles is equal to the number of second spray pipes, and the inlet ends of the several second nozzles are respectively connected to the top ends of the several second spray pipes.
[0014] Preferably, venturi nozzles are connected to the outlets in the middle region of the other electrophoresis liquid delivery pipes.
[0015] This utility model provides a bubble elimination device and an electrophoresis tank for the front drainage structure of automobiles, which have the following beneficial effects:
[0016] This application presents a device specifically designed to eliminate air bubbles in the drainage structure located between the windshield and engine compartment of a car during the electrophoresis process. Specifically, a row of first nozzles is installed on the electrophoresis liquid delivery pipe at the front of the electrophoresis tank via several first connecting pipes. Nozzles with gradually decreasing diameters from bottom to top are installed at the top of each first nozzle, and the spray direction of each nozzle is directed towards the opening of the drainage structure when the car body is immersed in the electrophoresis liquid. This ensures that when the car body is flipped and immersed in the electrophoresis liquid, the electrophoresis liquid in the electrophoresis liquid delivery pipe at the front of the electrophoresis tank is sprayed along each first connecting pipe, first nozzle, and first nozzle into the drainage structure to flush away air bubbles. Because the first nozzles are designed to face the opening direction of the drainage structure when the car body is flipped and immersed in the electrophoresis liquid, and because smaller nozzles are used, the electrophoresis liquid in the electrophoresis liquid delivery pipe at the front of the electrophoresis tank can be effectively injected into the drainage structure, improving the air bubble elimination effect and reducing defects in the drainage structure. Therefore, the device of this application has a simple structure, low equipment cost, and good effect on eliminating air bubbles in the drainage structure between the windshield and the engine compartment of a car, which helps to improve the production quality of automobiles. Attached Figure Description
[0017] To better understand the above and other objects, features, advantages, and functions of this utility model, reference can be made to the embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of this utility model and do not limit the scope of this utility model in any way; the parts in the drawings are not drawn to scale.
[0018] Figure 1 A schematic diagram of a bubble elimination device for a front-end drainage structure of an automobile, according to an embodiment of the present invention, is shown.
[0019] Figure 2 A schematic diagram of an electrophoresis tank according to an embodiment of the present invention is shown.
[0020] Explanation of reference numerals in the attached figures:
[0021] 1. Tank; 2. Electrophoresis liquid delivery pipe; 31. First connecting pipe; 32. First nozzle; 33. First nozzle; 34. Connecting rod; 35. Support rod; 4. Second nozzle; 5. Venturi nozzle. Detailed Implementation
[0022] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.
[0023] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.
[0024] To at least partially address one or more of the aforementioned problems and other potential issues, embodiments of this disclosure provide a bubble elimination device for automotive front-end drainage structures, such as... Figure 1 and Figure 2 As shown, it includes several first connecting pipes 31, several first nozzles 32, several first nozzles 33, connecting rods 34 and two support rods 35.
[0025] The number of first connecting pipes 31 is preferably equal to the number of outlets on the electrophoresis liquid delivery pipe 2 located at the front end of the electrophoresis tank, ensuring a sufficient number of nozzles are installed, which helps to improve the elimination effect on air bubbles in the drainage structure of the automobile; several first connecting pipes 31 are arranged along the extension direction of the electrophoresis liquid delivery pipe 2, and the inlets of several first connecting pipes 31 are respectively used to connect to several outlets on the electrophoresis liquid delivery pipe 2 located at the front end of the electrophoresis tank. Specifically, the inlets of the first connecting pipes 31 are connected to the outlets on the electrophoresis liquid delivery pipe 2 located at the front end of the electrophoresis tank. The liquid outlet is threaded, bonded, or welded; several first nozzles 32 are arranged along the extension direction of the electrophoretic liquid delivery pipe 2, the several first nozzles 32 are arranged parallel to each other and in the same plane, each first nozzle 32 is inclined upward, and the top of each first nozzle 32 faces the opening direction of the drainage structure when the car is immersed in the electrophoretic liquid, and the bottom ends of several first nozzles 32 are respectively connected to the liquid outlet of several first connecting pipes 31. Specifically, the bottom ends of the first nozzles 32 are threaded, bonded, or welded to the liquid outlet of the first connecting pipes 31.
[0026] In one specific embodiment, the first connecting pipe 31 includes a first pipe and a second pipe; the first pipe is preferably horizontally arranged and perpendicular to the electrophoresis liquid delivery pipe 2, and the inlet of the first pipe is connected to the outlet of the electrophoresis liquid delivery pipe 2. Specifically, the inlet of the first pipe and the outlet of the electrophoresis liquid delivery pipe 2 are threaded, bonded, or welded; the length direction of the second pipe forms an acute angle, a right angle, or an obtuse angle with the length direction of the first pipe, and the inlet of the second pipe is fixedly connected to the outlet of the first pipe. Preferably, the second pipe is horizontally arranged, and the length direction of the second pipe forms a right angle with the length direction of the first pipe. The first pipe and the second pipe are integrally formed; the number of first spray pipes 32 is equal to the number of first connecting pipes 31, and the first spray pipes 32 correspond one-to-one with the first connecting pipes 31. The bottom end of the first spray pipe 32 is connected to the outlet of the second pipe. Specifically, the bottom end of the first spray pipe 32 and the outlet of the second pipe are threaded, bonded, or welded.
[0027] In a preferred embodiment, the first connecting pipe 31 includes a first pipe and a second pipe; the first pipe is preferably horizontally arranged and perpendicular to the electrophoresis liquid delivery pipe 2, and the inlet of the first pipe is connected to the outlet of the electrophoresis liquid delivery pipe 2. Specifically, the inlet of the first pipe and the outlet of the electrophoresis liquid delivery pipe 2 are threaded, bonded, or welded together; the length direction of the second pipe forms an acute angle, a right angle, or an obtuse angle with the length direction of the first pipe. Preferably, the second pipe is horizontally arranged, and the length direction of the second pipe forms a right angle with the length direction of the first pipe. The length direction of the second pipe is the same as the arrangement direction of the first nozzle 32, i.e., the second pipe... The length direction of the first tube is the same as that of the electrophoresis liquid delivery tube 2. The second tube has an inlet and multiple outlets, distributed along its length. The inlet of the second tube is connected to the outlet of the first tube. Preferably, the first and second tubes are integrally formed. The number of first nozzles 32 is equal to the total number of outlets on the second tubes of the plurality of first connecting tubes 31. Each first nozzle 32 corresponds one-to-one with an outlet on the second tube. The bottom end of the first nozzle 32 is connected to an outlet on the second tube. Specifically, the bottom end of the first nozzle 32 is threaded, bonded, or welded to the outlet of the second tube. This embodiment helps to increase the number of nozzles, further improving the elimination effect on air bubbles in the drainage structure of the automobile.
[0028] The first nozzle 33 is a nozzle whose diameter gradually decreases from its bottom end to its top end. Preferably, the first nozzle 33 is a direct-shot nozzle. The spray direction of the first nozzle 33 is the same as the extension direction of the first nozzle 32. The number of first nozzles 33 is equal to the number of first nozzles 32. The bottom ends of several first nozzles 33 are respectively connected to the top ends of several first nozzles 32. Preferably, the bottom ends of the first nozzles 33 are threadedly connected to the top ends of the first nozzles 32.
[0029] The connecting rod 34 extends along the arrangement direction of the first nozzle 32. Preferably, the connecting rod 34 is located in the middle of each first nozzle 32, and the connecting rod 34 is connected to each first nozzle 32. Specifically, the connecting rod 34 is welded, bonded, or fixedly connected to the first nozzle 32 by cable ties. The support rod 35 is inclined upward, and the inclination direction of the support rod 35 is opposite to the inclination direction of the first nozzle 32. Two support rods 35 are located at both ends of the connecting rod 34, and the top end of the support rod 35 is connected to the end of the connecting rod 34. Specifically, both ends of the connecting rod 34 are provided with a tee pipe. The main pipe of the tee pipe is fixedly sleeved on the end of the connecting rod 34, and the branch pipe of the tee pipe is fixedly sleeved on the top end of the support rod 35. The bottom end of the support rod 35 is used to connect to the fixing frame of the electrophoresis liquid delivery pipe 2. Specifically, the bottom end of the support rod 35 is welded to the fixing frame of the electrophoresis liquid delivery pipe 2 or fixedly connected by cable ties or bolts.
[0030] This application also provides an electrophoresis tank, such as Figure 2 As shown, the device includes a tank 1, with several horizontally arranged and parallel electrophoretic liquid delivery pipes 2 laid at the bottom of the tank 1. The electrophoretic liquid delivery pipes 2 extend along the width direction of the tank 1. Several liquid outlets are opened on the same side of each electrophoretic liquid delivery pipe 2 along its extension direction. The two ends of each electrophoretic liquid delivery pipe 2 are fixedly connected to the bottom surface of the tank 1 by a fixing bracket. The device also includes a bubble elimination device for the front drainage structure of an automobile as described above. The liquid inlets of several first connecting pipes 31 are respectively connected to several liquid outlets on an electrophoretic liquid delivery pipe 2 located at the front end of the tank 1. The bottom ends of two support rods 35 are respectively connected to the fixing brackets at both ends of the electrophoretic liquid delivery pipe 2.
[0031] In a preferred embodiment, the electrophoresis tank of this application further includes a plurality of second connecting pipes, a plurality of second spray pipes 4, and a plurality of second nozzles; the inlets of the plurality of second connecting pipes are respectively connected to the outlets at both ends of other electrophoresis liquid delivery pipes 2, wherein other electrophoresis liquid delivery pipes 2 refer to other electrophoresis liquid delivery pipes 2 other than the electrophoresis liquid delivery pipe 2 located at the front end of the electrophoresis tank. Specifically, the inlets of the second connecting pipes are threaded, bonded, or welded to the outlets at both ends of other electrophoresis liquid delivery pipes 2; each second spray pipe 4 is vertically upward or inclined upward. The bottom ends of several second nozzles 4 are respectively connected to the liquid outlets of several second connecting pipes. Specifically, the bottom ends of the second nozzles 4 are threaded, bonded, or welded to the liquid outlets of the second connecting pipes. The second nozzles are nozzles with a diameter that gradually decreases from their bottom to their top. The spray direction of the second nozzles is the side of the car body when the car is immersed in the electrophoresis solution. The number of second nozzles is equal to the number of second nozzles 4. The liquid inlet ends of several second nozzles are respectively connected to the top ends of several second nozzles 4. Specifically, the liquid inlet ends of the second nozzles are threaded to the top ends of the second nozzles 4. More preferably, Venturi nozzles 5 are respectively connected to the liquid outlets located in the middle region of other electrophoresis solution delivery pipes 2, wherein the liquid outlets located in the middle region of other electrophoresis solution delivery pipes 2 refer to the liquid outlets of other electrophoresis solution delivery pipes 2 other than their two end liquid outlets.
[0032] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand this document.
Claims
1. A bubble elimination device for a front-end drainage structure of an automobile, characterized in that: It includes several first connecting pipes (31), several first nozzles (32), several first nozzles (33), connecting rods (34), and two support rods (35); The inlets of several first connecting pipes (31) are respectively used to connect to several outlets on the electrophoresis liquid delivery pipe (2) located at the front end of the electrophoresis tank; Several first nozzles (32) are arranged parallel to each other and in the same plane. Each first nozzle (32) is inclined upward. The top of each first nozzle (32) faces the opening of the drainage structure when the car is immersed in the electrophoretic liquid. The bottom ends of several first nozzles (32) are respectively connected to the liquid outlet of several first connecting pipes (31). The first nozzle (33) adopts a nozzle whose diameter gradually decreases from its bottom end to its top end. The spray direction of the first nozzle (33) is the same as the extension direction of the first nozzle (32). The number of first nozzles (33) is equal to the number of first nozzles (32). The bottom ends of several first nozzles (33) are respectively connected to the top ends of several first nozzles (32). The connecting rod (34) extends along the arrangement direction of the first nozzle (32) and is connected to each of the first nozzles (32); The support rod (35) is inclined upward, and the inclination direction of the support rod (35) is opposite to the inclination direction of the first nozzle (32); the two support rods (35) are located at both ends of the connecting rod (34), the top end of the support rod (35) is connected to the end of the connecting rod (34), and the bottom end of the support rod (35) is used to connect to the fixing frame of the electrophoresis liquid delivery pipe (2).
2. The bubble elimination device for the front drainage structure of an automobile according to claim 1, characterized in that: The number of the first connecting pipes (31) is equal to the number of liquid outlets on the electrophoresis liquid delivery pipe (2) located at the front end of the electrophoresis tank.
3. The bubble elimination device for the front-end drainage structure of an automobile according to claim 2, characterized in that: The first connecting tube (31) includes a first tube and a second tube; the inlet of the first tube is connected to the outlet of the electrophoresis liquid delivery tube (2); the length direction of the second tube is at an acute angle, a right angle or an obtuse angle with the length direction of the first tube, and the inlet of the second tube is fixedly connected to the outlet of the first tube; the number of first nozzles (32) is equal to the number of first connecting tubes (31), the first nozzles (32) correspond one-to-one with the first connecting tubes (31), and the bottom end of the first nozzle (32) is connected to the outlet of the second tube.
4. The bubble elimination device for the front drainage structure of an automobile according to claim 2, characterized in that: The first connecting pipe (31) includes a first pipe and a second pipe; the inlet of the first pipe is connected to the outlet of the electrophoresis liquid delivery pipe (2); the length direction of the second pipe is at an acute angle, a right angle or an obtuse angle with the length direction of the first pipe, the length direction of the second pipe is the same as the arrangement direction of the first nozzle (32), the second pipe has an inlet and multiple outlets, the multiple outlets are distributed along the length direction of the second pipe, the inlet of the second pipe is connected to the outlet of the first pipe; the number of first nozzles (32) is equal to the total number of outlets of the second pipe on several first connecting pipes (31), the first nozzles (32) correspond one-to-one with the outlets on the second pipe, and the bottom end of the first nozzle (32) is connected to the outlet on the second pipe.
5. The bubble elimination device for the front drainage structure of an automobile according to claim 1, characterized in that: The connecting rod (34) is located in the middle of each first nozzle (32).
6. The bubble elimination device for the front drainage structure of an automobile according to claim 1, characterized in that: Both ends of the connecting rod (34) are provided with tee pipes. The main pipe of the tee pipe is fixedly sleeved on the end of the connecting rod (34), and the branch pipe of the tee pipe is fixedly sleeved on the top of the support rod (35).
7. The bubble elimination device for the front drainage structure of an automobile according to claim 1, characterized in that: The first nozzle (33) is a direct-fire nozzle.
8. An electrophoresis tank, comprising a tank body (1), wherein a plurality of horizontally arranged and parallel electrophoretic liquid delivery pipes (2) are laid at the bottom end of the tank body (1), the electrophoretic liquid delivery pipes (2) extend along the width direction of the tank body (1), and a plurality of liquid outlets are provided on the same side of each electrophoretic liquid delivery pipe (2) along its extension direction, and both ends of each electrophoretic liquid delivery pipe (2) are fixedly connected to the bottom surface of the tank body (1) by a fixing bracket, characterized in that: It also includes a bubble elimination device for the front drainage structure of an automobile as described in any one of claims 1 to 7, wherein the inlets of a plurality of first connecting pipes (31) are respectively connected to a plurality of outlets on an electrophoretic liquid delivery pipe (2) located at the front end of the tank (1), and the bottom ends of two support rods (35) are respectively connected to the fixing frames at both ends of the electrophoretic liquid delivery pipe (2).
9. An electrophoresis tank according to claim 8, characterized in that: It also includes several second connecting pipes, several second spray pipes (4) and several second nozzles; the inlets of several second connecting pipes are respectively connected to the outlets at both ends of other electrophoretic liquid delivery pipes (2); each second spray pipe (4) is set vertically upward or inclined upward, and the bottom ends of several second spray pipes (4) are respectively connected to the outlets of several second connecting pipes; the second nozzles are nozzles with a diameter that gradually decreases from the bottom end to the top end, and the spray direction of the second nozzles is the side of the car body when the car is immersed in the electrophoretic liquid. The number of second nozzles is equal to the number of second spray pipes (4), and the inlets of several second nozzles are respectively connected to the top ends of several second spray pipes (4).
10. An electrophoresis tank according to claim 9, characterized in that: The other electrophoretic liquid delivery tubes (2) are connected to Venturi nozzles (5) at the outlets in the middle region.